Separately, the U.S. Department of Justice — as part of an ongoing lawsuit filed last week — asked a federal judge to order that state elections officials isolate ballots ranking Dan J. Sullivan to investigate potential voter "confusion" with the two-term incumbent Republican Dan Sullivan.

Democratic Senate candidate Mary Peltola denied Thursday that she knew anything about an effort to put another candidate on the Alaska ballot with the same name as the Republican incumbent as the Justice Department escalated a criminal investigation with new grand jury subpoenas.

President Donald Trump called for the criminal prosecution of the Democratic candidate running for Senate in Alaska on Wednesday after revelations that her campaign appeared to be involved in recruiting a candidate with the same name as Republican incumbent Dan Sullivan.